Compound for tempering iron and steel



UNITED STATES PATENT OFFICE.

. BYRON VOHN ALDRICH, OF VANDALIA, MICHIGAN.

COMPOUND FOR TEMPERING IRON AND STEEL.

No Drawing.

To all whom it may concern:

Be it known that I, g YRON V. ALDRIoH, a citizen of the United io'tates, and a resident of Vandalia, in the county of Cass and State of Michigan, have invented certain new and useful Improvements in Compounds for Tempering Iron and Steel, of which the following is a specification.

My invention relates to improvements in compounds for tempering iron and steel, and it consists in the combination of ingredients and manner of use herein described and claimed. I

The foremost object of my invention 1s to provide a compound of a few simple ingredients, which when applied to the metal in the state in which the compound is put on the market as described, will effectively temper or harden it. The compound is of such a nature that any iron worker or blacksmith can temper with it by following the simple instructions ordinarily printed on the container of the compound. The ingredients are as follows:

Sal soda (sodium carbonate) Gparts Brimstone (sulfur) iparts Black antimony 1 part Rosin 1 part These ingredients are all separately powdered or pulverized, then thoroughly mixed together in the proportions stated above. The resultant compound is then ready for use.

The following method is employed in tem- Specification of Letters Patent.

pering an article of low grade steel, for example: The article is placed in the fire and heated to a cherry red, whereupon it is withdrawn and some of the tempering compound sprinkled thereon. The article is then returned to the fire and reheated to a cherry red, withdrawn and dipped in luke-Warm water until it becomes a deep blue or until a file will not take hold of the metal when pushed across. The article is then cooled in water which has the chill removed, that is to say, the water is cool.

Upon carrying out this method it will be found that the low grade steel article is so toughened as to bring it up to the efiiciency of high grade steel. In the same manner, low carbon steel is brought up to the efliciency of high carbon steel, and furthermore, the tempering compound can be used on ordinary cast iron. The compound can be employed for tempering such toolsas picks, punches, chisels, drills, and the like.

I claim 2'- Patented Dec. 7, 1920..

Application filed March 17, 192i}. Serial No. 366,521.

l. The herein described tempering compound, comprising sal soda, sulfur, black antimony, and rosin, pulverized, mixed and used substantially in the manner and for the BYRON VOHN ALDRICH. 

